The reactor building of the Bushehr nuclear power plant, outside the southern city of Bushehr, Iran The US is looking to negotiate a “first step” deal with Iran which would halt parts of its nuclear programme in return for modest suspension of sanctions, a senior US official said on Wednesday ahead of a crucial new round of talks . The initial agreement could last for six months and would “put time on the clock” in order to allow for a more detailed negotiation about Iran’s nuclear programme. The administration official also warned that any effort by the US Congress to impose new sanctions on Iran could scupper the negotiations. “For the first time, Iran appears to be committed to moving this negotiating process forward quickly,” the US official said. “We do not see them using the negotiating process to buy time.” US officials […]